Hi hamedfazelm
to the Surface Engineering Forum.
This is a fairly old Metco computer aided plasma spraying system (similar to the first Metco EG 88) with Ar2000 robot. The workings are much the same as a 9MC system but with computer control and yes gases are mass flow controlled.
I would contact Sulzer Metco for more detailed information even though this dates back to Perkin Elmer Metco days. Unit is probably 20+ years old, though looks in good condition. It would have been the cream of crop back in those days